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问题
单项选择题
外电源接触器EPC闭合的首要条件是：（）.
A、外电源质量合格
B、外电源面板上的E、F端子插好并接通
C、外电源启动好
D、外电源频率正常
答案
参考答案：B
补全对话，情景问答
从方框中选择正确答案，将其序号填入题前括号里。
( ) 1. What time is it?
( ) 2. Where's Wendy?
( ) 3. How many lights are there in your classroom?
( ) 4. Is this your clock?
A. There are six.
B. Wendy is beside the class.
C. It's six o'clock.
D. Yes, it is.
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名词解释
蛙盂
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